diff --git a/css/leptonChrome.css b/css/leptonChrome.css
index dc91b81e..d535cd47 100644
--- a/css/leptonChrome.css
+++ b/css/leptonChrome.css
@@ -6666,6 +6666,9 @@
         background-color: var(--tabs-border-color);
       }
     }
+    #tabs-newtab-button::before {
+      left: calc(50% - (8px + var(--toolbarbutton-inner-padding)));
+    }
   }
   @supports not -moz-bool-pref("userChrome.tab.newtab_button_like_tab") {
     .tab-stack::before,
diff --git a/src/tab/unselected_tab/_dynamic_separator.scss b/src/tab/unselected_tab/_dynamic_separator.scss
index 3477d6a0..d9c4f3a4 100644
--- a/src/tab/unselected_tab/_dynamic_separator.scss
+++ b/src/tab/unselected_tab/_dynamic_separator.scss
@@ -47,6 +47,9 @@
     /* More position */
     transform: translateX(var(--tab-separator-position-x)) translateY(var(--tab-separator-position-y));
   }
+  #tabs-newtab-button::before {
+    left: calc(50%  - (8px + var(--toolbarbutton-inner-padding)));
+  }
 }
 
 @include NotOption("userChrome.tab.newtab_button_like_tab") {